Solid line = floor (spellings that unambiguously belong to the group). Shaded band up to the dashed edge = ceiling (the most it could reach if every ambiguous spelling counted here).
Juliana is now well below its former popularity. All-time it's been given to 120,108 U.S. babies, the 363rd most common name by sound today, peaking at 4,012 in 2007, with 1,982 in 2025.
By sound, Juliana also includes the spellings Julianna.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).